Measurement Computing DAC488 v.1 - Manual (Page 94)

88 DAC488 Commands DAC488 User’s Manual
? - Query
TYPE System Command (Command Support)
SYNTAX ? Returns present configuration or mode of the command preceding the ? .
DESCRIPTION
All DAC488 commands offer a Query (?) option which may be used to determine the present configuration or mode of
a command previously executed. To use this option, the first letter of the command is used, followed by a question
mark (?). Any number of these Query commands may be combined into one string to allow the user to construct a
specialized status command requesting the DAC488 to return only that information which is of interest for a given
application. The Execute (X) command is not needed when using the Query option of a command.
EXAMPLE 1: SRQ Status.
PRINT#1,"CLEAR09" Line 1: Reset the DAC488.
PRINT#1,"OUTPUT09;M32 X" Line 2: Select SRQ on error.
PRINT#1,"OUTPUT09;M?" Line 3: Determine last Mmask command executed.
PRINT#1,"ENTER09" Line 4: Read data from the DAC488.
INPUT#2,A$
PRINT A$ Line 6: Display shows: M032.
EXAMPLE 2: Port 1 Status Using Status Command (U).
PRINT#1,"OUTPUT09;A0 C0 P1 R3
V8.12345 X"
Line 1: Autoranging off, Direct Control mode, Select port 1,
±
10 volt
range, output 8.12345 volts.
PRINT#1,"OUTPUT09;U8 X" Line 2: Request actual output voltage and range of port 1.
PRINT#1,"ENTER09" Line 3: Read data from the DAC488.
INPUT#2,A$
PRINT A$ Line 5: Display shows the status message: A0C0P1R3V+08.12250
Note: The programmed voltage was rounded to the nearest value.
EXAMPLE 3: Port 1 Status Using Query Command (?).
PRINT#1,"OUTPUT09;A0 C0 P1 R3
V8.12345 X"
Line 1: Autoranging off, Direct Control mode, Select port 1,
±
10 volt
range, output 8.12345 volts.
PRINT#1,"OUTPUT09;A?C?P?R?V?" Line 2: Request the status of port 1.
PRINT#1,"ENTER09" Line 3: Read data from the DAC488.
INPUT#2,A$
PRINT A$ Line 5: Display shows the same status message:
A0C0P1R3V+08.12250